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EP1916882B1 - High-pressure discharge lamp operating device - Google Patents

High-pressure discharge lamp operating device Download PDF

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Publication number
EP1916882B1
EP1916882B1 EP20060781598 EP06781598A EP1916882B1 EP 1916882 B1 EP1916882 B1 EP 1916882B1 EP 20060781598 EP20060781598 EP 20060781598 EP 06781598 A EP06781598 A EP 06781598A EP 1916882 B1 EP1916882 B1 EP 1916882B1
Authority
EP
European Patent Office
Prior art keywords
voltage
discharge lamp
starting pulse
starting
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP20060781598
Other languages
German (de)
French (fr)
Other versions
EP1916882A4 (en
EP1916882A1 (en
Inventor
Tsutomu Takatsuki
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Osram GmbH
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Osram GmbH
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Filing date
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Publication of EP1916882A4 publication Critical patent/EP1916882A4/en
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Publication of EP1916882B1 publication Critical patent/EP1916882B1/en
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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices
    • H05B41/2821—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/24—Circuit arrangements in which the lamp is fed by high frequency AC, or with separate oscillator frequency
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/02—Details
    • H05B41/04—Starting switches
    • H05B41/042—Starting switches using semiconductor devices
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/16—Circuit arrangements in which the lamp is fed by DC or by low-frequency AC, e.g. by 50 cycles/sec AC, or with network frequencies
    • H05B41/18—Circuit arrangements in which the lamp is fed by DC or by low-frequency AC, e.g. by 50 cycles/sec AC, or with network frequencies having a starting switch
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/30—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp

Definitions

  • the present invention relates to a high-voltage discharge lamp lighting system and, more particularly, to a high-voltage discharge lamp lighting system provided with a starting-pulse generation circuit.
  • Fig. 7 is a block diagram showing a conventional high-voltage discharge lamp lighting system.
  • the high-voltage discharge lamp lighting system is constituted in such a manner that, when a commercial power source 1 is turned on, a control power supply circuit 10 produces a control power supply to operate a control circuit 9, which thus transmits a control signal to a boosting inverter 3, a voltage-dropping inverter 4, a rectangular wave circuit 6 and a starting pulse generation circuit 7; and thus, these elements start to operate, respectively.
  • the boosting inverter 3 boosts the output, which has been rectified by a rectifier circuit 2, up to a normal voltage, and the voltage-dropping inverter 4 adjusts its output so that the current flowing to a high-voltage discharge lamp 8 can become a normal current.
  • a rectangular wave circuit 6 outputs an AC rectangular voltage of a normal frequency to a high-voltage discharge lamp 8.
  • the rectangular wave circuit 6 outputs an AC rectangular voltage of a normal frequency.
  • the starting pulse generation circuit 7 generates a high-voltage pulse to start the high-voltage discharge lamp 8.
  • Fig. 8 is a block diagram showing in detail the start pulse generation circuit 7.
  • the start pulse generation circuit 7 operates to produce a high-voltage pulse only when the high-voltage discharge lamp 8 is to be started.
  • the start pulse generation circuit 7 comprises a transformer T1, a FET (field-effect transistor) being a switching element which can be turned on or off by an external control signal, a capacitor C1 which is charged with a DC voltage Vcc which has been raised by a boosting inverter 3, an inductance L1 which performs the over-current protection of the FET, and a capacitor C2 which serves to block the high-voltage pulses, which are produced across the transformer T1, from running around into the rectangular wave circuit 6.
  • a FET field-effect transistor
  • the start pulse voltage is prescribed to be 3 to 5 kVp, for example.
  • the start pulse voltage is attenuated by the resulting increase of the output capacity and thus becomes lower than the normal voltage value of the starting pulse voltage of the lamp, so that, in case the output wiring length is 10 m for example, there occurs the problem that the lamp cannot start. Therefore, there is the rule according to which the output wiring length of a high-voltage discharge lamp lighting system must be 2 meters or less; and this serves as a restriction on the make-up of said system (See Fig. 9 ).
  • a high-voltage discharge lamp lighting system is constructed in such a manner that a starting pulse voltage of 4 kVp is outputted at a point of the output wiring length which point lies 10 meters ahead, then it is accepted, but, if this high-voltage discharge lamp lighting system is operated within a distance of 2 meters, then the starting pulse voltage becomes higher than 5.6 kVp, so that there is caused the danger that a leak may be caused in the wiring, the socket, the high-voltage discharge lamp or the like.
  • the present invention has been made in order to give a solution to the above-mentioned problem, and it is the object of the present invention to provide a high-voltage discharge lamp lighting system constructed in such a manner that, by the feedback of a starting pulse voltage, said starting pulse voltage is stabilized, whereby the starting pulse voltage can be maintained within a normal value range even if the output wiring length is increased to enhance the output capacity.
  • the high-voltage discharge lamp lighting system which comprises a high-voltage discharge lamp, a starting pulse generation circuit which feeds a high starting voltage to said high-voltage discharge lamp, and a control circuit for controlling said starting pulse generation circuit, characterized in that said starting pulse generation circuit comprises a boosting transformer for raising the pulse voltage generated by the ON/OFF operation of a switching element, a feedback voltage detection winding provided to said transformer, a voltage division circuit for dividing the voltage produced across said feedback voltage detection winding, and a pulse detection circuit for detecting the starting pulse voltage component from the output delivered from said voltage division circuit and feeding back the thus detected pulse voltage component to said control circuit.
  • the high-voltage discharge lamp lighting system can maintain the starting pulse voltage within the normal range of values.
  • 1 Commercial power supply
  • 2 Rectifier circuit
  • 3 Boosting inverter
  • 4 Voltage-lowering inverter
  • 5 Current-detecting resistor
  • 6 Rectangular wave circuit
  • 7 Starting pulse generation circuit
  • 8 High-voltage discharge lamp
  • 9 Control circuit
  • 10 Control power source circuit
  • 11 Voltage division circuit
  • 12 Pulse detection circuit.
  • Figs. 1 to 6 show Embodiment 1 of the present invention, of which Fig. 1 shows the output voltage measurement of the starting pulse generation circuit 7 when the output wiring length is altered, Figs. 2 and 3 show the measurement results of the starting pulse voltage when the wiring length is altered, Fig. 4 and 5 show the voltage V(C) of the FET (Field-effect transistor) and the measurement result of the starting pulse voltage V(B) when the wiring length is altered, and Fig. 6 shows in detail the starting pulse generation circuit 7.
  • the overall arrangement of the high-voltage discharge lamp igniting system is the same as that of the conventional high-voltage discharge lamp lighting system; however, the feature of this embodiment of the present invention lies in the starting pulse generation circuit 7.
  • the output wiring length is stipulated to be two meters or shorter.
  • the starting of the high-voltage discharge lamp becomes irregular in case the starting pulse voltage value is 3.5 kVp, and, in case the starting pulse voltage value is 3.0 kVp, the high voltage discharge lighting system does not start.
  • a starting system constructed in such a manner that, by feeding back the starting pulse voltage, a reliable starting voltage value is secured, so that no failure is caused in the starting of the lamp.
  • the starting pulse voltage V (A) and the starting pulse voltage V(B) at the point A and the point B in Fig. 1 referred to in the above Item (1) were measured by varying the output wiring length.
  • the wiring used in this experiment is a VVF cable.
  • the result of this measurement is shown in Figs. 2 and 3 .
  • Concerning the output wiring lengths, 0, 0.5, 1, 2, 4, 6, 8 and 10 meters, the starting pulse voltage V(A) and the starting pulse voltage V (B) at point A and point B were measured.
  • the starting pulse voltage V(A) and the starting pulse voltage V(B) at the point A and at the point B are approximately equal to each other irrelevantly to the output wiring length. Accordingly, if, for example, the starting pulse voltage V(A) is controlled to 4 kVP, then the starting pulse voltage V(B) can also be controlled to approximately 4 kVp.
  • the FET voltage V(C) and the starting pulse voltage V(A) are correlated to each other; that is, by controlling the FET voltage V(C) which is low in voltage value, the starting pulse voltage V (A) can be controlled.
  • the FET voltage V(C) is less than 1/10 of the starting pulse voltage V(A) . It is sufficient to feed back a voltage which is lower than 1/10 of the starting pulse voltage V (A) ; and thus, the system can be made of a small-sized circuit.
  • the FET voltage V (C) is higher than the desirable voltage, 10 VP which is desirable for the feedback, but, if said FET voltage V(C) is sufficient to be about 300 Vp though it is greater than 10 Vp desirable for the feedback, then the feedback circuit can be composed by the use of a plurality, yet small in number, of circuit parts.
  • the voltage division circuit 11 is made of, e.g. a resistor, whereby the given voltage is divided to arbitrary voltages. As the feedback voltage, it is also possible to lower the given voltage to the order of 10 Vp.
  • a pulse detection circuit 12 is connected to the voltage division circuit 11.
  • various voltage components are contained in addition to the necessary starting pulse voltage component.
  • the pulse detection circuit 12 detects the starting pulse voltage component from among these voltage components.
  • This control circuit 9 controls the FET voltage V(C) so that the starting pulse voltage V (A) may become a fixed voltage of, for example, 4 kVp.
  • a low voltage (for example, 50 Vp) across the feedback voltage winding N3 provided in the transformer T1 is further divided, by the voltage division circuit 11, to a still lower voltage, whereby a necessary starting pulse voltage component is detected by the pulse detection circuit 12 and fed back to the control circuit 9; and therefore, the starting pulse voltage V (A) can be maintained at, e.g. 4 kVp.
  • the starting pulse voltage remains approximately the same without regard to the output wiring length, so that, if the starting pulse voltage V(A) is maintained at the above-mentioned 4 kVp, then the starting pulse voltage at a point 10 meters ahead can also be held at approximately the same voltage value.

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  • Circuit Arrangements For Discharge Lamps (AREA)

Description

    Technical Field
  • The present invention relates to a high-voltage discharge lamp lighting system and, more particularly, to a high-voltage discharge lamp lighting system provided with a starting-pulse generation circuit.
    • Background Technique
  • Fig. 7 is a block diagram showing a conventional high-voltage discharge lamp lighting system. The high-voltage discharge lamp lighting system is constituted in such a manner that, when a commercial power source 1 is turned on, a control power supply circuit 10 produces a control power supply to operate a control circuit 9, which thus transmits a control signal to a boosting inverter 3, a voltage-dropping inverter 4, a rectangular wave circuit 6 and a starting pulse generation circuit 7; and thus, these elements start to operate, respectively. The boosting inverter 3 boosts the output, which has been rectified by a rectifier circuit 2, up to a normal voltage, and the voltage-dropping inverter 4 adjusts its output so that the current flowing to a high-voltage discharge lamp 8 can become a normal current. A rectangular wave circuit 6 outputs an AC rectangular voltage of a normal frequency to a high-voltage discharge lamp 8. The rectangular wave circuit 6 outputs an AC rectangular voltage of a normal frequency. The starting pulse generation circuit 7 generates a high-voltage pulse to start the high-voltage discharge lamp 8.
  • Fig. 8 is a block diagram showing in detail the start pulse generation circuit 7. The start pulse generation circuit 7 operates to produce a high-voltage pulse only when the high-voltage discharge lamp 8 is to be started. The start pulse generation circuit 7 comprises a transformer T1, a FET (field-effect transistor) being a switching element which can be turned on or off by an external control signal, a capacitor C1 which is charged with a DC voltage Vcc which has been raised by a boosting inverter 3, an inductance L1 which performs the over-current protection of the FET, and a capacitor C2 which serves to block the high-voltage pulses, which are produced across the transformer T1, from running around into the rectangular wave circuit 6.
    • Patent Literature 1: JP Patent Application Disclosure No. (Hei) 11-307285 .
    • Patent Literature 2: JP Patent Application Disclosure No. 2000-306688 .
    • Patent Literature 3: JP Patent Application Disclosure No. 2002-75673 .
    Disclosure of the Invention Problem to be solved by the Invention
  • In case of a high-voltage discharge lamp such as a high-luminance, high-voltage discharge lamp or the like, the start pulse voltage is prescribed to be 3 to 5 kVp, for example. In case of the high-voltage discharge lamp lighting system, if the length of the output wiring is increased, then the start pulse voltage is attenuated by the resulting increase of the output capacity and thus becomes lower than the normal voltage value of the starting pulse voltage of the lamp, so that, in case the output wiring length is 10 m for example, there occurs the problem that the lamp cannot start. Therefore, there is the rule according to which the output wiring length of a high-voltage discharge lamp lighting system must be 2 meters or less; and this serves as a restriction on the make-up of said system (See Fig. 9). If a high-voltage discharge lamp lighting system is constructed in such a manner that a starting pulse voltage of 4 kVp is outputted at a point of the output wiring length which point lies 10 meters ahead, then it is accepted, but, if this high-voltage discharge lamp lighting system is operated within a distance of 2 meters, then the starting pulse voltage becomes higher than 5.6 kVp, so that there is caused the danger that a leak may be caused in the wiring, the socket, the high-voltage discharge lamp or the like.
  • The present invention has been made in order to give a solution to the above-mentioned problem, and it is the object of the present invention to provide a high-voltage discharge lamp lighting system constructed in such a manner that, by the feedback of a starting pulse voltage, said starting pulse voltage is stabilized, whereby the starting pulse voltage can be maintained within a normal value range even if the output wiring length is increased to enhance the output capacity.
  • The high-voltage discharge lamp lighting system according to the present invention which comprises a high-voltage discharge lamp, a starting pulse generation circuit which feeds a high starting voltage to said high-voltage discharge lamp, and a control circuit for controlling said starting pulse generation circuit, characterized in that
    said starting pulse generation circuit comprises a boosting transformer for raising the pulse voltage generated by the ON/OFF operation of a switching element,
    a feedback voltage detection winding provided to said transformer,
    a voltage division circuit for dividing the voltage produced across said feedback voltage detection winding, and
    a pulse detection circuit for detecting the starting pulse voltage component from the output delivered from said voltage division circuit and feeding back the thus detected pulse voltage component to said control circuit.
    • Effect of the Invention
  • The high-voltage discharge lamp lighting system can maintain the starting pulse voltage within the normal range of values.
    • Brief Description of the Drawings
    • [Fig. 1] shows Embodiment 1 of the present invention, wherein there is shown, particularly, the output voltage of the starting pulse generation circuit which (output voltage) is measured when the output wiring length is altered.
    • [Fig.2] shows Embodiment 1 of the present invention, wherein there is shown, particularly, the result of the measurement of the starting pulse voltage when the wiring length is altered.
    • [Fig. 3] shows Embodiment 1 of the present invention, wherein there is shown, particularly, the result of the measurement of the starting pulse voltage when the wiring length is altered.
    • [Fig. 4] shows Embodiment 1, wherein there are shown, particularly, the results of measuring the FET voltage V (C) and the starting pulse voltage V (B) when the wiring length is altered.
    • [Fig. 5] shows Embodiment 1 of the present invention, wherein there are shown, particularly, the result of measuring the FET voltage V(C) and the starting pulse voltage VB when the wiring length is altered.
    • [Fig. 6] shows Embodiment 1 of the present invention, wherein, particularly, the starting pulse generation circuit is shown in detail.
    • [Fig. 7] is a block diagram showing the conventional high-voltage discharge lamp igniting system.
    • [Fig. 8] shows the conventional starting pulse generation circuit 7 in detail.
    • [Fig. 9] shows the relationship between the conventional high-voltage discharge lamp lighting system and the starting pulse voltage thereof.
    Explanation of Reference Numerals
  • 1: Commercial power supply, 2: Rectifier circuit, 3: Boosting inverter, 4: Voltage-lowering inverter, 5: Current-detecting resistor, 6: Rectangular wave circuit, 7: Starting pulse generation circuit, 8: High-voltage discharge lamp, 9: Control circuit, 10: Control power source circuit, 11: Voltage division circuit, 12: Pulse detection circuit.
    • Most desirable Embodiment for Execution of the Invention Embodiment 1
  • Figs. 1 to 6 show Embodiment 1 of the present invention, of which Fig. 1 shows the output voltage measurement of the starting pulse generation circuit 7 when the output wiring length is altered, Figs. 2 and 3 show the measurement results of the starting pulse voltage when the wiring length is altered, Fig. 4 and 5 show the voltage V(C) of the FET (Field-effect transistor) and the measurement result of the starting pulse voltage V(B) when the wiring length is altered, and Fig. 6 shows in detail the starting pulse generation circuit 7.
  • Additionally, the overall arrangement of the high-voltage discharge lamp igniting system is the same as that of the conventional high-voltage discharge lamp lighting system; however, the feature of this embodiment of the present invention lies in the starting pulse generation circuit 7.
  • As stated in the foregoing part, entitled "Background Technique", of this specification, if the output wiring length is increased, then the starting pulse voltage value falls; and thus, if the starting pulse voltage value comes to fall below the starting voltage of the high-voltage discharge lamp, then there is caused, in some cases, even the inconvenience that the high-voltage discharge lamp does not start. Generally, in the case of a high-voltage discharge lamp lighting system, the output wiring length is stipulated to be two meters or shorter. The starting of the high-voltage discharge lamp becomes irregular in case the starting pulse voltage value is 3.5 kVp, and, in case the starting pulse voltage value is 3.0 kVp, the high voltage discharge lighting system does not start.
  • According to the present patent application, there is proposed a starting system constructed in such a manner that, by feeding back the starting pulse voltage, a reliable starting voltage value is secured, so that no failure is caused in the starting of the lamp.
  • For the realization of the above-mentioned starting system, it is indispensable to assure that the below-stated two conditional points be satisfied:
    1. (1) The first point is that the values, at a point A and a point B, of the output voltage from a starting-pulse generation circuit 7 are approximately equal to each other. For example, in case the voltage at the point B is 3 kVp even if the voltage at the point A is 5 kVp, the lamp is not started even if the output voltage (which has a value approximately the same value as the voltage value at the point A) of the starting pulse generation circuit is fed back.
    2. (2) In the case of controlling the starting-pulse voltage, the starting pulse voltage is a high voltage of 3 to 5 kVp, and thus, it is necessary to use a large number of high voltage-withstanding parts, so that the structure is large-sized. Further, even if such high voltage-withstanding parts are mounted, they will prove to be useless at the ordinary lighting time. The voltage to be fed back is suitably 10 Vp or so. In the starting-pulse generator circuit 7 shown in Fig. 8, a transformer T1 is used, but, if there is a correlation between the FET voltage V(C) before the voltage is boosted and the starting pulse voltage V (B) being the voltage at a point B positioned ahead of the output wiring length, then the voltage at the point B located ahead of the output wiring length becomes controllable by controlling the FET voltage V (C) which is the lower voltage.
  • Thus, the starting pulse voltage V (A) and the starting pulse voltage V(B) at the point A and the point B in Fig. 1 referred to in the above Item (1) were measured by varying the output wiring length. The wiring used in this experiment is a VVF cable. The result of this measurement is shown in Figs. 2 and 3. Concerning the output wiring lengths, 0, 0.5, 1, 2, 4, 6, 8 and 10 meters, the starting pulse voltage V(A) and the starting pulse voltage V (B) at point A and point B were measured. As a result, it was confirmed that, as shown in Figs. 2 and 3, the starting pulse voltage V(A) and the starting pulse voltage V(B) at the point A and at the point B are approximately equal to each other irrelevantly to the output wiring length. Accordingly, if, for example, the starting pulse voltage V(A) is controlled to 4 kVP, then the starting pulse voltage V(B) can also be controlled to approximately 4 kVp.
  • Next, in order to confirm what is stated in above Item (2), the FET voltage V (C) and the starting voltage V(A) before the boosting by the transformer T1 were measured; and the result thus obtained is shown in Figs. 4 and 5.
  • It has been found that, as shown in Figs. 4 and 5, the FET voltage V(C) and the starting pulse voltage V(A) are correlated to each other; that is, by controlling the FET voltage V(C) which is low in voltage value, the starting pulse voltage V (A) can be controlled. The FET voltage V(C) is less than 1/10 of the starting pulse voltage V(A) . It is sufficient to feed back a voltage which is lower than 1/10 of the starting pulse voltage V (A) ; and thus, the system can be made of a small-sized circuit. The FET voltage V (C) is higher than the desirable voltage, 10 VP which is desirable for the feedback, but, if said FET voltage V(C) is sufficient to be about 300 Vp though it is greater than 10 Vp desirable for the feedback, then the feedback circuit can be composed by the use of a plurality, yet small in number, of circuit parts.
  • By reference to Fig. 6, explanation will now be made concerning the starting pulse generation circuit 7 according to this embodiment of the present invention. To a transformer T1, a feedback voltage detection winding N3 is added. More concretely, if, for example, a primary winding N1 is made of 6 turns of a wire, a secondary winding N2 is made of 88 turns of a wire, and a feedback voltage detection winding N3 is made of 1 turn of a wire, then it results that the FET voltage V(C) = 300 Vp, the starting pulse voltage (A) = 4.4 kVp, and the feedback voltage V(F) = 50 Vp.
  • To the feedback voltage detection winding N3, a voltage division circuit 11 is connected. The voltage division circuit 11 is made of, e.g. a resistor, whereby the given voltage is divided to arbitrary voltages. As the feedback voltage, it is also possible to lower the given voltage to the order of 10 Vp.
  • Moreover, to the voltage division circuit 11, a pulse detection circuit 12 is connected. In the output of the voltage division circuit 11, various voltage components are contained in addition to the necessary starting pulse voltage component. The pulse detection circuit 12 detects the starting pulse voltage component from among these voltage components.
  • Then the output from the pulse detection circuit 12 is fed back to a control circuit 9. This control circuit 9 controls the FET voltage V(C) so that the starting pulse voltage V (A) may become a fixed voltage of, for example, 4 kVp.
  • As mentioned above, according to this embodiment of the present invention, a low voltage (for example, 50 Vp) across the feedback voltage winding N3 provided in the transformer T1 is further divided, by the voltage division circuit 11, to a still lower voltage, whereby a necessary starting pulse voltage component is detected by the pulse detection circuit 12 and fed back to the control circuit 9; and therefore, the starting pulse voltage V (A) can be maintained at, e.g. 4 kVp. It has been confirmed that, up to about 10 meters in length of the output wiring, the starting pulse voltage remains approximately the same without regard to the output wiring length, so that, if the starting pulse voltage V(A) is maintained at the above-mentioned 4 kVp, then the starting pulse voltage at a point 10 meters ahead can also be held at approximately the same voltage value.

Claims (1)

  1. A high-voltage discharge lamp lighting system which has a high-voltage discharge lamp (8), a starting pulse generation circuit (7) for feeding a starting high-voltage to said high-voltage discharge lamp (8), and a control circuit (9) for controlling said starting pulse generation circuit (7),
    characterized in that
    said starting pulse generation circuit (7) comprises
    a transformer (T1) for boosting a pulse voltage produced by an ON/OFF operation of a switching element (FET),
    a feedback voltage detection winding (N3) provided to said transformer (T1),
    a voltage division circuit (11) for dividing the voltage produced across said feedback voltage detection winding (N3), and
    a pulse detection circuit (12) which detects a starting pulse voltage component from the output of said voltage division circuit (11) and feeds it back to said control circuit,
    wherein said control circuit (9) maintains, at a predetermined value, the voltage after it is boosted by said transformer (T1).
EP20060781598 2005-08-17 2006-07-25 High-pressure discharge lamp operating device Not-in-force EP1916882B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005236379A JP4759105B2 (en) 2005-08-17 2005-08-17 High pressure discharge lamp lighting device
PCT/JP2006/314686 WO2007020776A1 (en) 2005-08-17 2006-07-25 High-pressure discharge lamp operating device

Publications (3)

Publication Number Publication Date
EP1916882A1 EP1916882A1 (en) 2008-04-30
EP1916882A4 EP1916882A4 (en) 2014-05-07
EP1916882B1 true EP1916882B1 (en) 2015-04-29

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EP20060781598 Not-in-force EP1916882B1 (en) 2005-08-17 2006-07-25 High-pressure discharge lamp operating device

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EP (1) EP1916882B1 (en)
JP (1) JP4759105B2 (en)
KR (1) KR101226179B1 (en)
CN (1) CN101243729B (en)
AU (1) AU2006280899B2 (en)
WO (1) WO2007020776A1 (en)

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JP2009176640A (en) * 2008-01-28 2009-08-06 Panasonic Electric Works Co Ltd High pressure discharge lamp lighting device, lighting fixture
JP5069573B2 (en) * 2008-01-28 2012-11-07 パナソニック株式会社 High pressure discharge lamp lighting device, lighting fixture
JP2009176638A (en) * 2008-01-28 2009-08-06 Panasonic Electric Works Co Ltd High pressure discharge lamp lighting device, lighting fixture
EP2249626B1 (en) * 2008-01-28 2019-07-03 Panasonic Intellectual Property Management Co., Ltd. High-voltage discharge lamp lighting device, and illuminating device using the same
JP5081001B2 (en) * 2008-01-28 2012-11-21 パナソニック株式会社 High pressure discharge lamp lighting device, lighting fixture
JP2009176642A (en) * 2008-01-28 2009-08-06 Panasonic Electric Works Co Ltd High pressure discharge lamp lighting device, lighting fixture
JP2009176639A (en) * 2008-01-28 2009-08-06 Panasonic Electric Works Co Ltd High pressure discharge lamp lighting device, lighting fixture
JP2009238382A (en) 2008-03-25 2009-10-15 Panasonic Electric Works Co Ltd High-voltage discharge lamp lighting device, and luminaire
CN102047762A (en) * 2008-04-24 2011-05-04 松下电工株式会社 High voltage discharge lamp lighting device and light fixture

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Also Published As

Publication number Publication date
EP1916882A4 (en) 2014-05-07
KR101226179B1 (en) 2013-01-24
CN101243729B (en) 2011-08-10
CN101243729A (en) 2008-08-13
AU2006280899B2 (en) 2011-04-07
KR20080036150A (en) 2008-04-24
JP2007052977A (en) 2007-03-01
EP1916882A1 (en) 2008-04-30
JP4759105B2 (en) 2011-08-31
WO2007020776A9 (en) 2007-05-10
WO2007020776A1 (en) 2007-02-22
AU2006280899A1 (en) 2007-02-22

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